Abstract
Rubber mounts are frequently used for the isolation of structure-borne vibrations in the low-frequency range. However, not much research has been done in the acoustic frequency range. In this essay the sound isolation behavior of rubber mounts is investigated by means of the finite element method. The static preload is described by a nonlinear elastic material model. For dealing with the dynamic behavior, a linear viscoelastic model with frequency-dependent parameters is used. The influence of different material parameters on the transmissibility and on the dynamic stiffness of different resilient elements is examined. The calculations are compared with experimental data. For this a measurement apparatus has been set up based on ISO 10 846. Further on, the interaction between resilient elements and a structure supported on them is investigated. The supported structure is chosen to be a plate made of steel. The plate is not regarded to be rigid. The influence of different mounts on the structure-borne sound of the plate is examined. Additionally, it is researched how the sound isolation changes when eigenfrequencies of the supported plate and of the elastic mounts are approximately the same.
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